Mounting for thermionic tubes



Jan, 1, 1929. 1,697,039

M. ZEH

MOUNTING FOR THERMIONIC TUBES Filed Jan. 19, 1926 E m: I if I? L I VENTOK ATTORNEY:

MARTIN ZEH, OF BERLIN,

PATENT OFFlCE.

GERMANY, ASSIGNOR 'ro THE rum: 1m. Euro-Er. HUTH ens.

m. B. 11., or BERLIN, GERMANY.

MOUNTING ron rnnnmoivio Tunas.

- Application filed January 19, 1926, Serial No. 82,205, and in Gerinany lanuary 27, 1925.

The present invention relates to means for mounting thermionic tubes such as are used in radio receiving sets. By the present invention it is proposed to so construct a mounting for such thermionic tubes as will permit the same mounting to be used for any of the various sized tubes now being used in the several different makes of broadcast receiving sets.

Furthermore, it is the object of this invention to provide a construction of mounting that will be economical to manufacture and which will at the same time improve the operating characteristics of the mounting.

My invent-ion may be best understood from the accompanying drawings, wherein Figure 1 is a top plan view of one embodiment of my invention;

Fig. 2 is a side elevation, and

Figs. 3 and 4 are detail views.

By the present invention the terminal pins of the thermionic tubes are clamped underneath the base plate of the mounting by laterally movable pressure springs which firmly hold each contact pin.

The mounting is provided with a plurality of holes of greater length than diameter and the pressure springs are so mounted and constructed thatpressure contact is obtained on the terminal pin of the thermionic tube regardless of the position of the contact pin in the elongated hole. By such construction, it is also possible to have a mounting using a single pressure contact spring.

Referring to the drawings, a base plate 1, which is preferably constructed of insulating material, is provided with a plurality of elliptical holes arranged at right angles to each other. In the design of themounting, the narrow axes of'these holes are made large enough to receive the largest terminal pin of thermionic tubes now in use and the longer axes are so proportioned as to be larger than the diameter of the terminal pins of the thermionic tube and long enoughto accommodate the pins that are farthest apart on the thermionic tubes now in use. i

-A lurality of angular brackets 3 are secured to thelower side of the 1 by any proper means such as the screws 3' shown in Fig. 1.

lthe short leg of the bracket 5 is provided with a reduced extension 7 which is adapted to be bentupwardly and when the brackets 3 are assembled on the. base 1, the extension 7 engages in the hole 8 in the base 1 as shown v structed and mounted. It will be noted that the extension 7 is rectangular and that the hole 8 is also rectangular. In this way, the

bracket 7 is securely held from rotary movement.

Each of the brackets 3 has secured thereto a. pressure spring 4. The spring is so mounted and formed as to be normally biased to a position'wherein it extends partially across an opening 2. As shown in Fig. 1, the spring extends more than half way across the Width of this opening. Accordingly, the width of the contact spring is normally designed to extend over the entire length of the openmg 2. I A

As the thermionic tube is inserted in the mounting described above, the terminal pins will enter the opening 2 and move the springs 4 laterally. In order to guide this lateral movement of the springs, the springs are designed with a flat, contracted portion 9 which extends through and is guided in an opening 10 in the respective bracket-s 3. Since it is desirable to limitthe outward or lateral movement of the springs 4, the free ends thereof are bent downwardly as indicated at 11 in Fig. 3.

In the embodimentshown in the present drawings, the springs 4 are riveted to the brackets 3. In order that circuit connections may be made to the brackets 8 and through the brackets 3 and springs 4 to the terminal pins of the thermionic tube, an extension 12 is provided on the long leg of the bracket 3 to which connections may soldering.

Modifications may be made in the-arrangement, location and construction of parts within the spirit and scope of my invention and such modifications are intended to be covered by the appended claims.

I claim: F

1. A mounting for thermionic tubes comprising a base member provided with elliptically shaped apertures to receive thermionic be made by tubes of different type of pin terminal ar-- rangement, bracket members adjacent said apertures depending from the under surface of said base member, each of said bracket members having a short portion secured to the under surface of said base member and a longer portion extending substantially at right angles to the short portion, and a resilient member carried by said longer portion and extending over the corresponding one of said apertures to exert contact pressure on said pin terminals in a direction of the small axis of said elliptic apertures.

2. A mounting for thermionic tubes comprising a base member provided with ellipti'cally shaped apertures to receive thermionic tubes oi? difi'erent type of pin terminal arrangement, bracket members adjacent said apertures depending from the under surface of said base member, each of said bracket members having a short portion secured to the under surface of said base mem-' ber and a longer portion extending substan-- tially at right angles to the short portion,

said base member, resilient elements extending oversaid apertures to extend contact pressure on said pin terminals in a dlrection of the small axis of the elliptic apertures,

each of said contact supports comprising an angularly disposed strip member with one end of said strip member secured beneath said base member and the other end of said strip member carrying one of said resilient elements, said strip members being furthermore slotted intermediate their ends and a tongue extending from one end of each of said resilient elements through said slotted strip member for limiting the lateral movement'of said resilient contact with respect to said strip member.

4%. A mounting for thermionic tubes comprising a base provided with two pairs of elliptically shaped apertures, each pair being arranged diametrically along two lines perpendicular with respect to each other with the longer axis of the ellipse pointing in the direction of said lines, said apertures being large enough to receive thermionic tubes of difierent type of pin terminal arrangement, contact supports carried by said base, each contact support including a metallic strip bent substantially at right angles and depending from said base, a resilient contact member carried by said contact supports and extending each over one of said apertures to exert contact pressure on said pin terminals in. a direction of the small axis of the elliptic aperture, and means for guiding said contact member in a lateral direction with respect to said contact support.

In testimony whereof I aflix my signature.

MARTIN ZEH. 

